If I saw my picture published without permission, I think I would sue these people. And even if a person is not going to publish these photos, I'll still have the same reaction. Taking pictures of people without permission is really a big deal where I am.
Sara, with all due respect there is a difference between what would be legal and what someone likes or dislikes.
frau, I didn't directly answer your second question. If you are "publishing" and using the images for editorial use and not for advertisement then in general it is okay. There are certainly exceptions to any rule, so if you plan to publish, do your homework first (and IMO, get written consent when you can to try to avoid any lawsuits). http://www.pdimages.com/web9.htm